there is a little space there.campy wheels often leave very little space between the lockring and the dropout. mavic wheels are an exception. is it possible the lockring is insufficiently tightened? a little spacer compression, etc..

Had the same issue with the Campagnolo freehub on my 2011 Stinger 6's.

I found that my used 11spd Record casette would bind when I tightened the lockring, but a new 11spd Chorus casette would be OK. The local HED distributor swapped my freehub body, and I still had the same issue.

To fix this, I skimmed about 1 mm off the bottom threaded portion of the lock ring. Took about 5 minutes with a piece of 800 grit wet & dry paper on a flat surface.

I put the binding down to the fact that either the plastic spacers between the older casette cogs must have very slightly worn thinner over time, causing the lock ring to foul, or Campagnolo made a running change to the casette cog spacings.

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